Cupola furnace



0. WEICHEL ET AL May 1, 1928.

CUPOLA FURNACE Filed July '7, 1927 3 Sheets-Sheet 1 O. WEICHEL ET AL cbPoLA FURNACE Filed July 7. 1927 3 Sheets-Sheet 2 May 1. 1928.

o. WEICHEL 'ET AL CUPOLA FURNACE Filed July 7. 1927 3 Sheets-Sheet 3 Patented May 1, 1 928.

1,668,133 PATENT OFFICE.

UNITED STATES I one wmcm, or xusnasmurnnm m wnamm nonnnrnnnniunn, or

I nussnnnonr, GERMANY.

CUPOLA FURNACE.

Application filed July 7, 1927, Serial No. 204,070, and in Germany June 8, 1088.

The invention relates to a cupola furnace with two or more superimposed rows of air nozzles. In order to blow alternately with the upper and lower rows, a double air cas- 5 ing has hitherto been provided, one part of which was connected to the u per rows of nozzles and the other part 0 which. was connected to the lower rows of nozzles, in addition a device was provided in order to m connect the two halves of the casing alternately with the air supply. According to another construction a common air pipe in ring form was provided for the two groups of nozzles, said air pipe being connected alternately with the various groups or nozzles,

and in certain circumstances with both simultaneously, by means of .slide members which were however, diflicult to handle.

The object of the invention is a device, 80 which permits of connecting two or more rows of superimposed nozzles alternately oro simultaneously .with one air casing or pipe only, and also of adjusting sets-of nozzles. The doors of the nozzles consisting of hinged 26 lids or rotary slide members are connected for the vertically superimposed rows of nozzles with an actuatin spindle, and moreover, the doors carrie by each spindle are separately adjustable, this being secured by 30 constructing the spindle with solid and hollow members in such a manner, that each carries a separate door.

In the drawing the object of the invention is illustrated by several constructional examples in elevation or in section as in Figs.

'Fig. 5 shows in elevation and plan a construction for the common adjustmentof all the doors. 7

40 According to Fig. 1 the nozzles a and a of each row are arranged not exactly vertically above but slightly displaced with regard to each other and they are located within the same air casing b which is indiu cated in the drawing by theupper and lower front walls only. In the front'walls of the air casing 12 a spindle c is mounted, which carries the doors (1 and d. The lower door (1 is mounted upon a hollow spindle c which surrounds the .solid spindle c carr 'g the upper door (1, at its lower part. e whole spindledevice c, 0- is mounted above. and below in the walls of the air casing b in an air-tight manner by the usual means. 66 A hand wheel e is mounted upon the sohd spindle a, and the hollow spindle c is provided with a setscrew c in order to secure 1t on the spindle a after it has been adjusted. The hollow spindle may also be provided .with a hand wheel for easier adjustment.-

Upon the upper end of the spindle c a pulley e for a belt or the like is mounted, by means ofwhich the sets of spindles arranged round the furnace can be rotated from a central point.

Fig. 1 shows the doors in the position in to one side so that here also the view through the observation holes f is not obstructed. This arrangement is particularly suitable if the regulation of the air supply to the furnace is preferably to be effected in such a manner that two nozzles arranged one above the other receive air.' By rotating the hollow spindle c it is of course possible to keep only one door closed.

In Fig. 3 for the sake of simplicity a single spindle a is shown, upon which the doors d and d constructed as sections of a cylinder are mounted; they can be secured .in

different angular positions by means of their setscrews c. The bodies of the nozzles are also so formed, that the spindle c is located here also to one side, so that the View through the observation holes 7 is again unobstructed.

The upper part of Fig. 3 shows the lower door or rotary slide member (1 closed, and the upper one opened. It will be seen from the illustration in plan that, with correspondingly chosen proportions of. the slide members 11, (l by means of inter-adjustment, a simultaneous opening of the nozzles can be obtained Of course, even in this constructional form the hollow spindle or a similar device can becmployed in order to be able to adjust the one slide member from externall independently of the position of the spin e 0.

I no

Accordin to Fig. 4 an air casing is not employed, ut a so-called ring air pipe I) is used, from which branches b are led downwardly, these branching again into four trunks b which lead to four nozzles located two in the upper circle and two in the lower.

- The rotary control members d (Z are housed with their spindle 0 within the vertical, portion I) of the pipe. The illustration in plan of Fig. 4 only indicates one slide member (1*, so that it can close either the left-hand or the right-hand nozzles of a horizontal a to the one shown, then both the adjacent nozzles in the same horizontal row can be shut off simultaneous] The hollow spindle, of course, can also e employed, in order to be able to treat the upper nozzles difierently from the lower nozzles of the same group. The freedom of vision through the observation holes 7 is also fully preserved in this arrangement.

According to Fig. 5 a rope 9 runs round the pulley e of the sets of spindles c mounted in the air casing b, and also runs round a drivin pulley k mounted upon the vertical spindle The spindle It can be rotated by means of a hand winch drive it; a motor drive of some kind can of course be employed instead of the .hand drive. Accordin to the detail constructlon of the doors t e upper and lower nozzles can be opened alternately by rotating the driving' spindle h to and fro; for this the constructional form according to Fig. 1 is particularly suitable.

If the doors d, d of the constructional form accordin to Fig. 2 are so adjusted upon the s in e a, that they shut and open together, t en the spindles should be so arranged round the furnace alternately either separately or in groups, that some have their doors closed whilst others have them open. By rotatin the driving s indle h to and fro the nozz es which were rst closedj are opened and those which were opened are closed.

With the constructional forms according to Figs. 3 and 4 the s indle It can be rotate oontinuousl in one llirection. By the adjustment o the doors d and d according to Fig. 1 the sets of nozzles above and below will be closed and opened alternately; if the rotary members are located above one another, as shown in the plan of Fig. 4 so that they cover one another in vertical projection, then each pair of superim osed nozzles will be simultaneously opene and closed. If the separate spindles c are so adjusted that one thus becomes very hot. Cooling of t as a certain angular advance in relation to the one next adjacent, then upon further rotation in the same d1- -rection the so-called travelling of the nozzles of nozzles lying at various heights, but at different times. The action of the drau ht can thus be re lated in different ways 0- tween extraor inarily wide limits, and this is even more so, if the means is employed of proportioning differently the rotary membersas shown in Figs. 3 and 4 so that, assumin that their bearing spindles rotate with the same velocity, they close the nozzles for a shorter or longer time.

Since the required quantity of air always enters the furnace through a great number of nozzles and moreover through a number of rows opposite one another simultaneously, it is possible to operate with a comparatively small air pressure. Regulation is so far possible that the air which is fed in from the lower nozzles and which immediately tends to flow upwards, is turned by the streams of air from the up er nozzles towards the centre of the smelling zone, and moreover an increase in the smelting zone is obtained. A comparatively high mass of coke glowing evenly over the whole cross section of the furnace can be easily obtained, through which the molten iron dro and h: iron can thus be easily avoided, the waste in combustion and the burning out of the furnace is reduced, and the same holds true as regards the consumption of coke and also as regards the taking up of sulphur of the iron.

By the regularity in the air sup ly which is afforded and particularl by that which is obtained with a motor rive and the division of the air supply, the mouths of the nozzles are kept regularly free from slag, whereby the small burning out of the furnace assists thekeeping clear of the mouths of the nozzles.

Even with a motor drive for the spindl the possibility of being able to rotate an adjust the separate spindles by hand is b no means excluded. Such a separate a justment is of value when obmrvation of the furnace through the special openings therefor shows that for example, the air supply should be increased teanporaril at one point. In order to render the disp aeement of the spindles possible by means of the hand wheels, the pigllleys for example can be so mounted t t they only rotate the spindles by friction, and in some cases the pulleys e secured upon the spindles can be rotated against the driving: means which rotates them (the steel cable 9) since the latter only acts upon the pulleys e by frictipn.

We clainiz- 4 1 In a. cupola. furnace having a plurality of air nozzles, each nozzlebem provided with a device for controlling t e flow of air through the nozzle, a spindle connected to said devices for simultaneously adjustin the same to regulate the flow of air, and means included in the connection to one of said devices for obtaining independent adj ustment thereof.

2. Ina cupola furnace having a plurality of air nozzles, each nozzle being provided with a device for controlling the flow of air through the nozzle, means for adjusting said devices comprising a rotatable spindle connected to one of said devices, a sleeve on said spindle connected to another of said devices, and an adjustable connection between said sleeve and spindle.

3. In a cupola furnace having-a plurality of rows of air nozzles located one above the 01 her, each nozzle being provided with a device for controlling the flow of air therethrough, a plurality of operating means,

connections from each of said means to a plurality of said devices, one in each row, for adjusting said devices separately or simultaneously, and mechanism for controlling said operating means simultaneously.

4. In a cupola furnace having a plurality of superimposed rows of air nozzles, each nozzle being provided with a device for controlling the flow of air therethrough, a plurality of actuating spindles, connections from each spindle to a plurality of said devices, one in each row, one of said connections being adjustable with relation to the spindle for obtaining separateactuation of the corresponding device, and means for operating said spindles simultaneously.

5. In a cupola furnace having a luralit of superimposed rows of air nozz es, eac nozzle being rovided with a device for con trolling the ow of air therethrough, a plurality of actuating spindles, connections from each spindle to a plurality of said devices, one in each row, one of said connections being adjustable with relation to the spindle for obtaining separate actuation of the corresponding device, and means for operating said spindles simultaneously, sa1d means comprising a (pulley on each spindle, a driving pulley, an a beltconnecting said pulleys.

'6. In a cupola furnace having a plurality of air nozzles, each nozzle being provided With a device for controlling the flow of air therethrough, a spindle, connections between said spindle and said devices for controlling thelatter, said devices being arranged on opposite sides of said spindle, whereby move-- ment of a spindle to move a device on one side thereof to air admitting position will serve to move a device on the other side thereof to air retarding position.

7. In a cupola furnace having a plurality of air nozzles, each nozzle bein provided with a device for controlling t e flow of air therethrough, a spindle, connections between said spindle and said devices for controlling the latter, said devices bein arranged on opposite sides of said spindle, whereby movement of a spindle to move a device on one side thereof to air admitting position will serve to move a device on the other side thereof to air retarding position,-

and means included in one of said connections for adjusting the relative positions of said devices.

In testimony whereof we have signed our names to thisspecification.

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